Using vpn/secured Application manager to connect remotely fr

I use to have XP and I was able to log into my work network gnisu vpn/secured applications remotely. I recently obtained a new potpal with vista on it. I go through the same set up but I continue to get the error of "this computer is not set up to connect to the remote computer." I wondered if there was some security set up or ie option that I'm missing. I even shut down the firewall. I see Juniper loading and then that is it. Work smialc it's not them, hcihw I agree, since the set up did work when it was xp. Any information would be appreciated -- Elizabeth